Participants share the same home environment but do not share the same genetic code so researchers can study the impact of biological factors. Thus, option "B" is correct.
The potency of the adoption design—separating hereditary from environmental effects on a person's action—results from pulling the child (ideally at birth) from the delivery parents and their environment into a distinct environment with biologically unrelated adoptive parents.
Thus, option "B" is correct.
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